Assessing effects of “source-sink” landscape on non-point source pollution based on cell units of a small agricultural catchment

Ascertaining the relationship between "source-sink" landscape and non-point source(NPS) pollution is crucial for reducing NPS pollution, however, it is not easy to realize this target on cell unit scale. To reveal the relationships between "sourcesink" landscape and NPS pollution based on cell units of a small catchment in the Three Gorges Reservoir Region(TGRR), the runoff and nutrient yields were simulated first by rainfall events on a cell unit scale based on the Annualized AGricultural Non-Point Source Pollution Model(AnnAGNPS). Landscape structure and pattern were quantified with "sourcesink" landscape indicators based on cell units including landscape area indices and locationweighted landscape indices. The results showed that:the study case of small Wangjiagou catchment highlighted a good prediction capability of runoff and nutrient export by the AnnAGNPS model. Throughout the catchment, the spatial distribution trends of four location-weighted landscape indices were similar to the trends of simulated total nitrogen(TN) and total phosphorus(TP), which highlighted the importance of spatial arrangement of "source" and "sink" landscape types in a catchment when estimating pollutant loads. Results by Pearson correlation analysis indicated that the location-weighted landscape index provided a more comprehensive account of multiple factors, and can better reflect NPS-related nutrient loss than other landscape indices applied in single-factor analysis. This study provides new findings for applying the "source-sink" landscape indices based on cell units in small catchments to explain the effect of "source-sink" landscape on nutrient export based on cell unit, and helps improve the understanding of the correlation between "source-sink" landscape and NPS pollution.     

GPS掩星技术低轨卫星计划的现状及进展

主要介绍了几个国际上已经实施的GPS掩星计划（GPS／MET，Φrsted,Sunsat,SAC-C,CHAMP)和在研的（COSMIC，ACE）低轨卫星计划的现状及取得的进展。通过总结可知，下一代GPS掩星接收器应具有体积小、质量轻（几百克）、低功耗的特点；能提供实时的卫星物理状态参数；飞行器上的自主计算和控制；星上数据通信和命令解释；所有跟踪数据应符合厘米级精密定轨的要求；能提供掩星和海洋反射实验的测量。     

周口电信枢纽楼基坑降水设计方案技术经济分析

通过分析两种不同的基坑降水设计方案，阐述了降水技术要求，并介绍周边建筑物不均匀沉降的防治措施。     

Correlations among color,morphology, and luminosity for the luminous red galaxy (LRG) sample of the SDSS data release 5

We have investigated the correlations among color, morphology and luminosity for all LRGs, cut I LRGs, cut II LRGs, and Main galaxies that are also classified as LRGs. It is found that the morphology of LRGs is tightly correlated with luminosity. The rest-frame u-g color of cut I LRGs and cut II LRGs is nearly independent of luminosity, but the color of Main galaxies is correlated with luminosity. For cut I LRGs and Main galaxies, the early type proportion apparently changes with color: at the rest-frame u-g < 1.3 it increases strongly with increasing color, while at the rest-frame u-g > 1.3 it decreases with increasing color. We also notice that the morphology of cut II LRGs is only a weak function of color. Published in Astrofizika, Vol. 50, No. 3, pp. 335–345 (August 2007).     

Disk Thicknesses and Some Parameters of 108 Non-Edge-On Spiral Galaxies

We present disk thicknesses, some other parameters and their statistics of 108 non-edge-on spiral galaxies. The method for determining the disk thickness is based on solving Poisson's equation for a disturbance of matter density in three-dimensional spiral galaxies. From the spiral arms found we could obtain the pitch angles, the inclination of the galactic disk, and the position of the innermost point (the forbidden region with radius r 0 to the galactic center) of the spiral arm, and finally the thickness.     

一种CT中间件的研究与实现

开发的中间件,将用于支持不同交换机的计算机电话集成,实现交换机和应用系统之间的电话服务请求和状态消息传递,协调语音和附加数据同步转移,使客户端应用程序能够与服务器之间进行数据交换,屏蔽不同交换机拥有的CT中间件协议和CT中间件接口,使应用程序员无需关心消息是如何在计算机、交换机、自动语音应答服务器之间传递,无需关心交换机的私有协议与接口,而专注于客户端的应用开发,并且使客户端应用程序兼容不同交换机.     

记广东南雄盆地上白垩统主田组鸟脚类足迹及中国已命名的大型鸟脚类足迹的属级新观察

记述了广东省南雄盆地上白垩统主田组3组恐龙行迹,由杨梅坑足迹点的足迹命名了南雄鸭嘴龙足迹（Hadrosauropodus nanxiongensis ichnosp. nov.）一新种;古市足迹点的足迹归入鸭嘴龙足迹一未定种（Hadrosauropodus isp.）。这是中国鸭嘴龙足迹属的首次描述,将该足迹的分布从北美拓展至中国,并为南雄盆地存在大型的鸭嘴龙提供了新的化石证据。还整理了中国已描述的大型鸟脚类足迹：中国足迹（Sinoichnites）被定为非正式的塑模标本;扬子足印（Yangtzepus）被归入兽脚类足迹;禽龙足迹（Iguanodonopus）被认为是裸名,归入禽龙足迹（Iguanodontipus）;嘉荫足迹（Jiayinosauropus）增加了新材料并得以具体描述;内乡足迹（Neixiang footprint）得以重新描述。     

A New Retracking Technique for Brown Peaky Altimetric Waveforms

A new Brown-Peaky (BP) retracker has been developed for peaky waveforms that usually appear within ～10 km to the coastline. The main feature of the BP is that it fits peaky waveforms using the Brown model without introducing a peak function. The retracking strategy first detects the peak location and width of a waveform using an adaptive peak detection method, and then estimates retracking parameters using a weighted least squares (WLS) estimator. The WLS assigns a downsized weight to corrupted waveform gates, but an equal weight to other normal waveform gates. The BP retracker has been applied to 4-year Jason-1 waveform (2002–2006) in two Australian coastal zones. The results retracked by BP, MLE4 and ALES retrackers have been validated against tide-gauge observations located at Burnie, Lorne and Broome. The comparison results show that three retrackers have similar performance over open oceans with the correlation coefficient (～0.7) and RMSE (～13 cm) between altimetric and tide-gauge sea levels for distance >7 km offshore. The main improvement of BP retracker occurs for distance ≤7 km to the coastline, where validation results indicate that data retracked by BP are more accurate (15–21 cm) than those by ALES (16–24 cm) and MLE4 (19–37 cm).     

基于马尔可夫模型的天津海域污染治理投资策略研究

以天津约3 000 km2的海域环境质量为研究对象,运用马尔可夫法对天津海域2003-2007年的水质数据建立不同类别水质的海域转移概率模型,并引入污水排放量和水污染治理投资两个变量,采用多元回归分析法拟合转移概率同污水排放量和水污染治理投资之间的函数关系,研究为达到不同的污染治理目标而付出的污染治理投资,为天津海域环境治理投资决策提供了一定的参考意见.     

GPS在精密施工测量控制网中的应用

GPS工程控制网是目前应用最广泛的控制网,GPS测量在水利水电行业的施工测量控制网中也可以有很好的应用。通过某水电站枢纽区首级GPS控制网建立的实例,对高等级GPS工程控制网从设计、观测到数据处理及成果的可靠性验证进行了探讨。